timeout in testing scripts ignores the days if set to greater than 24 hours

The following testing script gets TIMEDOUT in 10 minutes.

Expectation is to run successfully or time out after 1 day 10 minutes. (24:05:00 from script + 5 min grace period in timeout in maas)

# --- Start MAAS 1.0 script metadata ---
# name: shouldfail5m
# title: CPU validation
# description: Run stress-ng memory tests for 12 hours.
# script_type: test
# hardware_type: cpu
# packages: {apt: stress-ng}
# timeout: 24:05:00
# --- End MAAS 1.0 script metadata ---

sudo -n stress-ng --aggressive -a 0 --class cpu,cpu-cache --ignite-cpu \
    --log-brief --metrics-brief --times --tz --verify --timeout 24h

Seems like the conversion of timeout datetime object in metadataserver code is ignoring the number of days [1]

[1] https://github.com/maas/maas/blob/master/src/metadataserver/api.py#L1251